Update usage.rst

[altendky]

Draft for:

• Maybe finding some more tweaks while working on other stuff.
• Figure out why neither :mod:`attr` nor :mod:`attrs` links properly.

[codecov]

Codecov Report

Merging #132 (c4590e4) into main (96d9cb1) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #132   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          446       446           
  Branches        69        69           
=========================================
  Hits           446       446           

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